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On an interesting note, I harvest my lettuce but don't chop off the head to low, (butter and romaine), and then get a complete second head very quickly since the root structure is already there.
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This is very interesting indeed. I have never grown lettuce as of yet, but always thought you would only get one head per plant. The butter lettuce I get at the store always has the root ball with it. The Romain is cut at the bottom and the base is about 2 to 3 inched where it was cut. Maybe the Romain plant gets much bigger than I figured to be able to make room for more heads.